In a food processor (or stand mixer) place the flour, icing sugar, a pinch of salt and unsalted butter (cold) cut into cubes. Mix until you get a sandy texture.
Beat 1 egg quickly and pour it over the dough. Mix until the dough just about sticks together.
Place in a cling film, and press it slightly into a flat rectangle for ease of rolling later on. Chill for 20 minutes.
Once chilled, roll out thinly (around 3mm thickness) and place in your tart mould. If you need to trim the edges for a more even finish, chill the dough beforehand.
Place aluminium foil inside the shape to avoid sides collapsing.
Bake in a pre-heated oven at 170°C (340°F) fan-assisted for 15minutes or until golden in colour. Let cool for 5-10 minutes, then carefully remove from tart mould and let cool on a cooling rack.
The Lime Curd
In a saucepan mix the eggs, sugar, lime zest and lime juice. Combine them by mixing.
Place the pan over medium-low heat and stir continuously to prevent sticking.
Once the curd thickens and the mixture starts to bubble, take it off heat and add butter chopped in cubes.
Incorporate well until the curd is silky smooth.
Place in a tray or tupperware and cover with cling film. The film should touch the surface of the curd, to prevent a crust from forming.
Let cool at room temperature for 20 minutes, then place in the fridge to harden for 30-40 minutes.
The Elderflower Blueberry Filling
To make the elderflower gin, place good quality gin in a bowl with dried elderflowers. Add 1 teaspoon of elderflower extract and let it infuse for 30 minutes. Sieve to remove the dried elderflower before using.
Place fresh blueberries in a saucepan, along with icing sugar, lemon juice and cornstarch. Mix slightly to combine.
Place on medium heat and stir gently to prevent sticking. Cook until the blueberries start getting a bit sticky
Add the elderflower gin and mix. The mixture will become quite thick and creamy.
Take off heat, cover with cling film and chill.
The Italian Meringue
In a small saucepan, place the water and sugar over low-medium heat to prevent browning.
When the sugar mixture reaches 110°C (230°F), start whipping the egg whites until reaching soft peaks.
When the sugar mixture reaches 120-121°C (250°F), pour it over the egg whites, whilst carefully mixing to incorporate.
The hot syrup will cook the meringue making it safe to eat. Continue mixing until you reach stiff peaks.
Place in a large piping bag with a large star nozzle.
The Chocolate Decorations
Melt white/vanilla candy buttons in the microwave for 30 seconds initially. Mix with a spoon, then place in microwave for short bursts of 10 seconds and mix again, to prevent it from burning.
Brush lustre dust in the silicone mould, then put the melted candy chocolate into the mould.
Smooth out the top, then place in the fridge for 15-20 minutes.
Assembling the Tarts
Place the lime curd inside a piping bag, then pipe it into each tart shell. It should come up to ¾ of the height of the tart shell.
Place the blueberries in the middle, making sure they don't reach the sides.
Pipe the meringue around the blueberries, making it into the shape of a cone or house roof.
Spray some lustre dust over the meringue to make it extra magical.
Place the chocolate decorations and edible flowers on top of the meringue. Sprinkle some fairy dust (also known as edible glitter) over the top.
Video
Notes
This recipe requires a kitchen scale in grams. Due to the complexity of the elements, cups cannot be used as measurements would not be accurate enough.
Italian Meringue: as the meringue will be eaten raw, it is crucial you use Italian Meringue. This method actually cooks the eggs, making them safe for consumption.
Blueberries: Use fresh blueberries, as they hold their shape much better when cooked.
Decorations: are entirely optional, but they do make for one very pretty tart. A silicone mould is needed for this step.
Storing: The tarts should be consumed within 1 day and kept in the fridge. If kept longer than one day, the meringue will become very sticky.